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(No Model.)

R. M. LAMBIE.

SWIVEL FOR BOOK HOLDERS. No. 324,032. Patented Augrll, 1885.

N4 PETERS, FhOlO-hlhographur, Wnhi nnnnnnn C4 ROBERT M. LAMBIE, OF NE\V YORK, N. Y.

SWIVEL FOR BOOK-HOLDERS.

SPECIFICATION forming part of Letters Application filed February 25, 1885.

T 0 all whom it may concern.-

Be it known that I, ROBERT M. LAMBIE, a resident of New York city, in the county and State of New York, have invented an Improved Swivel for Book-Holders, of which the following is a full, clear, and exact description, reference being made to the accompanying drawings, in which Figure 1 represents a side elevation of the book-holder containing my improved swivel. Fig. 2 is a horizontal section of the swivel, the line 0 c, Fig. 3, indicating the plane of section. Fig. 3 is a vertical section of the swivel. Fig. 4 is a bottom view of the bookshelf, and Fig. 5 a horizontal section on the line k k, Fig. 3.

The object of this invention is to providea proper swivel for the shelf or shelves that are applied to the upright posts of book-holders; and the invention consists, principally, in making said swivel of tapering form, and of wood or analogous substance, so that it shall be embraced by the tapering collar on the shelf, as hereinafter more fully described.

The invention also consists in other details of improvement that are hereinafter specified.

In the drawings, the letter A represents the base of a suitable book-holder, said base can rying a vertical post, B, to the upper part of which the book-holder proper, O, is secured. The post B is in this class of structures made vertically adjustable in the base A, passing for this purpose through a socket, a, which is formed at the upper part of said base, and which has a set-screw, b, for clamping the, post at any desired height. The lower end of the post, in order to prevent it from being aceidentally pulled out of the socket a, has ordinarily a nut, (I, screwed upon it, which is so tightly applied that it cannot be loosened without the use of special maehinerythat is to say, the user or purchaser of such a structure is not supposed to be in a position to detach said nut d. The upper end of the post B in this class of structures also ordinarily has a tubular extension-piece, e, screwed upon it in similar secure fashion that is, this tube 0 is not to be detached by the user of the apparatusand in the upper part of this tube the swivel D, which carries the book-holder G, is sustained, the set-serewf holding said swivel Patent No. 324,032, dated August 11,1885.

(No model.)

in any desired position. Although, therefore, the post B for the purpose of this invention is to be regarded as having at its ends, respectively, the irremovable projections or shoulders (Z and e, I nevertheless desire to apply to a post thus constructed, and after these shoulders are placed thereon, one or more shelves, E, upon which shelves books can be placed, and which shelves shall be swiveled to the post in such manner that they can be readily revolved. In fact, I find that bookholders of the kind thus far described, after having been sold, are frequently modified at the desire of the user by the addition thereto of such a shelf or shelves, E. In order to get this shelf on the post so that it shall be properly swiveled thereto and revolvable thereon I have provided the swivel F. This is a tapering tube of wood, made in two parts longitudinally, as shown in Fig. 2, of such a size that its internal bore shall correspond with the external circumference of the post B; in other words, when the two parts of the swivel F are placed together they hug the post B in manner clearly shown in Fig. 2. Suitable dowel-pins, g, may be applied to the contiguous faces of the sections of the swivelpiece F to retain them in their proper relative position when on the post. Externally this swivel-piece F is tapering-that is, of smaller diameter at the top than at the bot tom-and its larger diameter is to exceed the diameter of the shoulder or tube 6 on the post B. The shelf E has its central aperture lined by a tapering collar, h, the inner tapering bore of which corresponds to the outer tapering form of the swivelpiece F. This collar h, which is clearly shown in cross-section in Fig. 3, is by preference part of and in one piece with a metal cross-plate, G, that is attached to the under side of the shelf E and fastened thereto bysuitable screws, as indicated in Fig. 4; This cross-piece Gr braces the shelf E and prevents it from warping, and also serves to hold the tapering collar 71 In order to apply this shelf E, thus constructed,

to the post B, it is only necessary to detach from the post the screw f and the swivel D, and then to slip over the tube eand then over the post 13 the shelf E, having the collar h, it being understood that the collar is of larger IOO diameter internally than the tube 6 externally. After the shelf has thus been slipped over the post the two parts of the tapering swivel-piece F are made to hug the post he neat-h the shelf, and thereupon the shelf is brought down over and around the swivelpiece F until its collar 71 hugs the swivelpiece and holds its two parts tightly together. A suitable clamp, H, such as is represented in Figs. 3 and 5, is put around the post B and adjusted at the desired elevation as a means of support for the swivel-piece F. Thus supported, the shelf E can, together with its collar 7L and the swivel-piece F, be readily and easily revolved around the post B, and can be adjusted at any desired height on the post, and any suitable number of such shelves can be placed on the same post.

I have described thelswivel-piece F as being made of two parts, and I have shown why making it of two parts is of special advantage; but I do not desire to limit myself to making it of two parts, for whenever the post B has no lower shoulder (Z, or whenever its lower shoulder d is readily detachable from the post, or in case the upper tube 6 is readily detachable from the post, the tapering swivel-piece F may be made in one piece and slipped over the post from one end thereof.

I claim 1. The tubular swivel-piece F of tapering outer form, combined with the post B and with the shelf E, having tapering collar 71, substantially as herein shown and described.

2. The tapering swivel-piece F, made in two separable halves, combined with the post B and with the shelf E, having tapering collar h, substantially as herein shown and described.

3. The tapering swivel-piece F, combined with the post B, which it embraces, with the tapering collar h, which surrounds it, shelf E and brace G, said brace and collar being rigidly united, substantially as herein shown and described.

41. The tapering swivel-piece F, combined with the post B, tapering collar h, shelf E, and adjustable clamp H, substantially as and for the purpose herein shown and described.

ROBERT M. LAMBIE.

Vitnesses:

CHARLES G. M. THOMAS, HARRY M. TURK. 

